DC Motors and Generators
AC Motors and Alternators
Speakers and Microphones
CRT or Cathod Ray Tubes, either with plate deflection or magnetic deflection
I'll finish these notes later
Varistor (metal-oxide varistor)
Field Effect, Junction FETs
Metal Oxide Semiconductor
Triode, Pentode, Tetrode
Slide, Toggle, Rocker, Rotary,
SPST, SPDT, DPST, DPDT, 3PDT, etc.
Relays, SCR, Thyristor, Diac, Triac
Momentary, latching, NO, NC
Fuses and Circuit Breakers (AFCI, GFCI)
LED Strips, single color, multicolor, individually addressable
CRT - Plate or Magnetic Deflection
Light Input Devices
Photocells - resistive
Phototransistors - switching
483 lines in NTSC (National Television System Committee)
Charge Coupled Devices
Pyroelectric Vidicon Camera
A thermographic camera (also called an infrared camera or thermal imaging camera) is a device that forms an image using infrared radiation, similar to a common camera that forms an image using visible light. Instead of the 400–700 nanometre range of the visible light camera, infrared cameras operate in wavelengths as long as 14,000 nm (14 µm). Their use is called thermography. (Wikipedia)
An ultrasound scan, also referred to as a sonogram, diagnostic sonography, and ultrasonography, is a device that uses high-frequency sound waves to create images of the inside of the body.
The word "ultrasound," in physics, refers to sound with a frequency that humans cannot hear. In diagnostic sonography, the ultrasound is usually between 2 and 18 megahertz. Higher frequencies provide better quality images but are more readily absorbed by the skin and other tissue, so they cannot penetrate as deeply as lower frequencies. Lower frequencies can penetrate deeper, but the image quality is inferior.
Because sound waves are used instead of radiation, ultrasound scans are considered safe. Obstetric sonography is frequently used to check the baby in the womb. 'Ultrasound can heat tissues slightly, and in some cases, it can also produce very small bubbles (cavitation) in some tissues.
There is evidence that thymerosil alone (in vaccines) wasn't the cause, but take a kid who got 2,3,4 ultrasounds in the first trimester, who has certain genetic pre-dispositions, then add in vaccines, and yup you get late onset autism. fetuses try to move away from the ultrasound, they don't like it)
CAT scan -
A 'computerized tomography' (CT) (or 'computerized axial tomography' (CAT) scan) uses a computer that takes data from several X-ray images of structures inside a human's or animal's body and converts them into pictures on a monitor.
Tomography is the process of generating a 2-dimensional image of a slice or section through a 3-dimensional object. Similar to looking at one slice of bread within the whole loaf.
PET scan -
A PET scan uses radiation, or nuclear medicine imaging, to produce 3-dimensional, color images of the functional processes within the human body.
PET stands for positron emission tomography. The machine detects pairs of gamma rays that are emitted indirectly by a tracer (positron-emitting radionuclide), which is placed in the body on a biologically active molecule. The images are reconstructed by computer analysis. Modern machines often use a CT X-ray scan which is performed on a patient at the same time in the same machine.
Magnetic resonance imaging (MRI), also known as nuclear magnetic resonance imaging, is a technique for creating detailed images of the human body.
The technique uses a very powerful magnet to align the nuclei of atoms inside the body, and a variable magnetic field that causes the atoms to resonate, a phenomenon called nuclear magnetic resonance. The nuclei produce their own rotating magnetic fields that a scanner detects and uses to create an image.
MRI is used to diagnose a variety of disorders, such as strokes, tumors, aneurysms, spinal cord injuries, multiple sclerosis and eye or inner ear problems, according to the Mayo Clinic. It is also widely used in research to measure brain structure and function, among other things.
• MRI scans are a non-invasive and painless procedure
• Unlike X-rays and CT scans, MRI does not use ionizing radiation (which is potentially harmful to the patient)
• MRI is an acronym for magnetic resonance imaging
• Raymond Damadian created the first MRI full body scanner, which he nicknamed the "Indomitable." It is currently on display at the Smithsonian Institution
• The magnets used in an MRI scan need to be constantly cooled to a temperature of absolute zero (-459.67°F)
• Liquid helium is traditionally used to cool the magnets
• An upright MRI scanner has now been created, enabling patients to feel less claustrophobic
• The cost of an MRI scanner starts at $150,000
• Japan has the most MRI scanners, with 46.5 per one million citizens.
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